Jeannine, what caused the root-rot? To your question, if there are no roots, watering will do little. I assume you are doing what I would do when I root a cutting. I keep my potting soil slightly moist but never soggy-wet. You want well-draining potting soil. I also try to spritz the leaves every day while rooting. Rooting hormone might help root it.

drdawg (Ken Ramsey) - Tropical Plants & More
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If God wanted me to touch my toes, he would have put them on my knees.

@Jeannine46-- You could add a little 3 percent Hydrogen Peroxide to the water. I would do a 50/50 mix to water the first time or two. It will help cure the roots and help it from reoccurring. If the roots are in bad shape you can pour it on full strength, just do not let it sit in it. Researching hydrogen peroxide I found it does not harm plants and helps so many different problems they have especially the roots! May you have a joyful week!